This is the instruction book published by Tbhe Enterprise Optical Company for their Motiograph De Luxe 35mm theatre projectors.
It was published at the tail end of the silent era, a short time before most of the industry did a complete switch over to sound.
There is no publication date to be found anywhere but some of the equipment shown suggests it was published in or shortly after 1927.
The retouching done on this manual consisted of sharpening of each page, adjusting highlights and shadows and elimination of morie patterns in all the images. Things such as small stains were intentionally left in.
Scanning was done at 600 dpi with no filters. After each page was Photoshopped all files where complied into a PDF for uploading.
In all it, took over three hours to Photoshop this upload. Please do not remove the book plate.